Add new variant analysis view

[charisk]

Add a new variant analysis view that will support live results and will eventually replace the current remote queries view.

Mobbed with @koesie10 @robertbrignull and @shati-patel

As part of this we:

• Added a new configuration setting to control whether to enable new variant analysis live result flows.
• Added a new web view that will be used to render the outcome of a variant analysis.
• Added a new command that will be used to easily load up the view with some mock data. The command will be removed when we have implemented the required functionality.

Checklist

N/A - internal feature:

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[shati-patel]

Teeny comment (which you're welcome to ignore 😛), otherwise I think this looks good.

(Disclaimer: this isn't a particularly in-depth review, since I was at the mobbing session where we got this working. Feel free to wait for an "independent" review too)